Most people I have heard of just decant (pour back and forth) between two jars until whatever (I assume lye contaminated?) liquid is left by itself in one jar and the pure naptha + spice is in the other. I would advise against anyone smoking lye-contaminated substances but I'm not sure if its been proven to be a particularly hazardous threat. If you have the time -or patience, really- try to do the decanting or drawing out with a baster/syringe before freeze precipitation. I bet it'll be worth it for your first time knowing that its totally clean!
PS: It'd be useful to know the tek you used and materials because then again, the particles could be something else: dust, for instance, if you evaporated in a room with a lot of particulate before freezing or even other alkaloids or non-active lipids.
people who talk about revolution and class struggle without referring explicitly to everyday life, without understanding what is subversive about love and positive about the refusal of constraints, gots doo-doo in they teef.
..the above post is fictional. deal with it.